James Wade

File appears to be here:

* https://github.com/benbalter/wordpress-to-jekyll-exporter/blob/master/vendor/alchemy/zippy/src/Zippy.php

It’s from this vendor package:

* https://github.com/alchemy-fr/Zippy

It didn’t occur to me straight away, but this issue is likely because mbstring isn’t installed on this server.

There appears to be no mention of mbstring in the documentation:

* https://zippy.readthedocs.org/en/latest/

Issue raised here:

* https://github.com/alchemy-fr/Zippy/issues/98

Perhaps I wasn’t clear. Users want to add custom classes on a per caption basis.

Here’s an example:

One caption may be green, so the class to be added will be .caption-green, or red, so .caption-red, etc.